Looking for WS5100 Firmware

we still have some old WS5100 Controllers in use together with AP300 Access Points. I'm looking for the Firmware for these old devices. Especially the Version 3.3.5.0-002R or 3.3.3.0-006R.

Is there any way to download these nowadays?
If not, is there a way to copy the firmware from one controller to another? We have one device which has the 3.3.3.0 firmware installed.

The main reason for asking is because we have two Controllers with Redundacy Configuration in a Remote Site. One Controller has the 3.3.3.0 Firmware and the other runs on an even older 3.0.3.0.
Someone forgot to flash the seconds device years ago and sadly we dont have the flash files anymore.

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